Expanding mandrel.



G. W. OSBORN.

EXPANDING MANDREL APPLICANON FILED JULY 1s. een.

1,293,525. Peeemeed Feb. 4,1919.

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EXPANDING MANDREL.

y APPLICATION4 FILED IIILY 16, 1917. 1,293,525. e Patented Feb. 4,1919.

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` citizen of the United 'plied to and removed from 3 or gear mounted on sald shaft.

ASSIGNMENTS, or ILLINOIS, Ann ONE-HALF To .norm METAL uONE-FOURTH T0 WILLIAM C. URBAN, OF GRANITE EXPANDING MANDREL.

Specication of Letters Patent. l

i ratenteu ren. a, raie.

Application led July 16, 1917. Serial No. 18,762. i

To all whom t may concern.'

Beit known that l, GEORGE W. GSBORN, a States of America, a resident of Granite City, in the county of Madison, State of Illinois, have invented certain new and useful Improvements in Expending Mandrels, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, forming a part of this specification. My invention relates to improvements in expanding Inandrels adapted for use in securing work to lathes and the like. The main object of the invention is to produce a simple device of this kind adapted to `be expanded and contracted very easily, and very quickly, so that the work can be quickly apthe machine. The new device includes operating means Iwhereby the mandrel is expanded and contracted, and the parts are preferably so constructed that these operations can be performed very rapidly without stopping Vthe machine.

` Figure I `is a plan View of an expanding mandrel constructed in accordance with my invent1on,

also showing the means for rotating the mandrel and the means for expanding and contracting the same.

` Fig. II is a side elevation of the parts Ashown in Fig. I.

Fig. lll is a side elevation, partly in section. l

Fig. IV is an enlarged transverse section of the mandrel. Fig. V is a longitudinal section illustrating a modificatie Fig. VI is an end view of the mandrel shown in Fig. V.

A designates a frame provided with bearings 1 for a rotatable hollow shaft 2. Power may be transmitted to the hollow shaft 2 through the medium of a cone pulley wheelsll and 5, all of which are The expanding mandrel preferably comprises a rigid, or non-yielding, work-receiving sleeve B having a tapered portion 6 which frictionally engages a correspondingly tapered face at one end of the hollow shaft 2. The non-yielding sleeve B is provided with longitudinal slots for the reception of elongated gripping blocks 7, the latter being arranged radially to the axis of said sleeve, and they'may be moved toward and away from said axis. 'When the device is in service, the work is engaged and gripped by the outer faces of the gripping blocks 7. 4Each gripping block has an inclined inner face adapted to engage a correspondingly inclined face on the tapered head 8 formed at one end of an expanding rod 8. rlhe expanding rod 8 may be pulled longitudinally in one direction to force the gripping blocks 7 outwardly as shown in Figs. HI and l thereby forcing said blocks into engagement with the work (not shown) and said rod 8 may be shifted in the opposite directionl for the purpose of releasing the work from the mandrel. When the expanding rod is firmly held in the position shown in Fig. Ill, it retains the mandrel in its expanded condition, at the same time forcing the tapered portion 6 of the sleeve B into firm engagement with the hollow shaft 2. Spring rings 9, encircling the gripping blocks 7, tend to force the latter toward the axis of the sleeve B. These spring rings are preferably ends of the gripping blocks 7, and the latter are preferably grooved to receive said rin s.

he means for reciprocating the rod 8 to expand and contract the mandrel, preferably comprises an yabutment device consisting of an abutment block l0 screwed onto said rod 8 at a point beyond the hollow shaft 2, and a j'amb nut l1 impinging against said block 10. The operating means also includes thrust members which engage opposite sides of the abutment device to shift the expanding rod 8 in opposite directions. This abutment device, consisting of the elements 10 and 11, is screwed onto the rod 8 so that it can be accurately adjusted to coperate with different mandrels.

A tubular member 2 is screwed into one end of the hollow shaft 2 (Fig. lll) so as to form a continuation thereof, and the expending rod 8 extends from the outer end of said tubular member. rll`hrust dogs l2 are pivoted to the tubular member 2', and these dogs may be turned on their pivots for the purpose of engaging the abutment block 10 to shift the rod 8 in one direction. 13 designates a shiftable sleeve, slidably mounted on the tubular member 2', and provided located near the 9 l f y 1,293,525

with converging inclined faces 14: which able members away from the axis of said serve as cams for actuating the thrust dogs sleeve and into engagement with the work, 12. Arms 15, extending from the shiftable and means for shifting said expander-iii 0psleeve 13, are fixed to a thrust Collar 16 posite directions parallelwith its axis, so as adapted to engage the abutment n ilt 11- to move the yieldable members toward and 70 lt is important to note that the shiftable away from the work, said means comprising sleeve 13 is rigidly connected to the abutan abutment device secured to said ex ment collar 16 by means of the arms 15- pander, thrust members surrounding said When the sleeve 13 is shifted from the posiexpander at opposite sides of saidy abuttion shown in Fig. Il to the position shown ment device, Said thrust members *being 75 by full lines in Fig. III, rthe inclined faces adapted toengage said abutment device to 14c engage the thrust dogs 12, thereby turnshift said expander in opposite directions, ing said `dogs on :their pivots. forcing :them and means for actuatingv said thrust mem into yengagement -with the abutment lblock bers, i

i0 so as 'to move the butment device and 2.1'11 a dev-lecci the character described, .a so the IOd 8 111,011@ dllelol- The lOd 8 iS @h llS 4rotatable sleeve provided with yieldable firmly ,pulled to Athe `position Shown I Il Elggripping members adapted `to engage `the 111, with the result of forcing the gripping WQrk, an expander 01 fOr-@ing ASaid yieldblOClS 7 away flOHL the axis of the mandrel able members away from the axisof said and IltO engagement Wllll the WOIlC (11013 sleeve and into yengagement with the work, 85 Sl10WH When the Shiftbl@ Sleeve 13 1S 10- and means for shifting said expander in opstored from ,the position 'shown by full lines postte directions parallel with its axis, so as in Fie. III to the position shown in Flg- II, t@ move the -yieldabie members reward and Lthe inclined faces 14 pass from the vthrust away fromtheworlr, saidmeans comprising dogs l2, and ill@ lhluSt 0011511' 16 then `e11- an abutment device secured to said-expander, 0o gagesbhe abutment 111113 11 011 the `IO- 8 10 a pair ,of pivotal-ly supported dogs adapted restore said rod to the position shown 1n to Vengage one side of said abutment device Fgll- The `spring.rings 9, encircling the toA shifty the expander-in onev direction, a gripping blocks 7, the fome Sad blOCkS 0- thrnst member adapted to engage the oppoward the axis `of the mandrel to release the site side of saidv abutment device t@ shirt the 95 work therefrom. expander inthe opposite direction, and a y A Shifter 17, pivoted at 18 '1S ted t0 the shifter provided. with means for actuating Shftabl Slew@ 13 OI' the PUl'POSB 0f I'BGP said dogs, said thrust'member being secured rocating the latter on the tubular member E. to said shifter.` v I 19 designates a connecting rod, or link, coil- 3. In a device of the character' described, 100 ILeCtiIlg the Shifter 17 to an operating lever a hollow rotatable shaft, a work-receiving 20, the latter being pivota-lly supported at sleeve securedto said shaft, said work-ref at 21- l eeiving `sleeve being provided with yieldable .I will now be understood that the mangripping members adapted to lengagev the drei can be easily and quickly expanded and work, an expander comprising a rod having 106 contracted by merely Oscillating the Opeetan expanding member for forcing said'yielding lever 20, and this can. be done without able members awayfrom the aXiSf of Said stopping the machine. sleeve and into engagement with the work.

A. gear wheel 22, fixed to the hollow shaft said rod being extended from i one end 'of 2, may be llSed for the purpose of transmit said hollow rotatable shaft, and means for 110 ting power to other parts of the lathe, which shifting said expander in opposite direcare not shown for the reason that they do tions parallel with its axis` so as to` move the not form part of the present invention. yieldable gripping members toward and Figs. V andy VI illustrate a modification away from the work, said means comprising consisting of a worleleoeivng Sleeve B', un abutment device secured to the'extended 11 slotted at 23 to form yieldable gripping portion of said rod at a point beyond said members 7 This sleeve is also provided hollow rotatable shaft thrust dogs' pivoted with a tapered portion 6 corresponding to to said hollow rotatable shaft and adapted the tapered portion 6 of the sleeve shown in to engage one side of said abutment device Fig. III. The inner faces of the yielding to move the'expander in one direction-,fa 12| gripping members 7 are inclined to receive thrust member arranged at-the'opposite side a tapered head 8a at onev end of an expand of said abutment device 'and adapted to ing rod 8", and this rod may be actuated by ceperate therewith to shiftr said expander the operating means Ldisclosed in Figs. l, in the opposite direction, a shiftable sleeve II and 111. v slidably mounted on said hollow rotatable 12 1 claim: l shaft, said shiftable sleeve being` secured to 1 In a device of the character described, a said thrust member and provided with in'- rotatable sleeve provided with yieldable clined faces which engage said thrust dogs gripping members adapted to engage the to turn the latter on their pivots, and means work, an expander for forcing said yieldfor reciprocating saidshiftjablesleeve. 1I

4. In a device of the character described,

a rotatable sleeve provided with yieldable gripping members adapted to engage the Work, an expander for forcing said yieldable members away from the axis of said sleeve and into engagement with the Work, and means for shifting said expander in opposite directions parallel with its axis, so as to move the yieldable members toward and away from the Work, said means comprising an abutment device adjustably secured to said expander, thrust members adapted to engage said abutment device to shift said expander in opposite directions, and means for actuating said thrust members.

In testimony that I claim the foregoing I hereunto aiix my signature.

GEORGE W. OSBORN.

Copies of this patent may be obtained fer ave cento einen, by addreming time Gommiaioner el? @atenta mhlngton, D. G. 

